P-Early-Media Trusted to Untrusted
This table illustrates the P-CSCF case when messages are received from trusted endpoints and forwarded to untrusted endpoints.
Message Parameters configured on egress interface | Request (Invite, UPDATE, PRACK) w/o header | Request (Invite, UPDATE, PRACK) with header with one or more direction parameters where each has one of the values: "sendrecv", "sendonly", "recvonly", or"inactive" | Response (18x, 200OK(UPDATE/PRACK)) w/o header. | Response (18x, 200OK(UPDATE/PRACK) with header with one or more direction parameters where each has one of the values: "sendrecv", "sendonly", "recvonly", or"inactive" |
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p-early-media-header-"add" p-early-media-direction -"sendonly" |
Setup flows based on SDP value. | Discard the header. Setup flows based on SDP value. | Setup flows based on SDP value. |
Discard the header. Setup flows based on local config PEM value. Status Flow AVP in AAR message updated. |
p-early-media-header-"modify" p-early-media-direction -"sendonly" |
Setup flows based on SDP value. | Discard the header. Setup flows based on SDP value. | Setup flows based on SDP value. | Discard the header. Setup flows based on local config PEM value. Status Flow AVP in AAR message updated. |
p-early-media-header-"add" No p-early-media-direction |
Setup flows based on SDP value. | Discard the header. Setup flows based on SDP value. | Setup flows based on SDP value. | Discard the header. Setup flows based on default PEM value. Status Flow AVP in AAR message updated. |
p-early-media-header-"modify" No p-early-media-direction |
Setup flows based on SDP value. | Discard the header. Setup flows based on SDP value. | Setup flows based on SDP value. | Discard the header. Setup flows based on default PEM value. Status Flow AVP in AAR message updated. |